What is the latest OS a 2012 MacBook Pro can support?
Could you please help get the latest version for MacBook Pro version 12 or later?
[Re-Titled by Moderator]
MacBook Pro 15″, macOS 12.7
The latest compatible OS for a 2012 MacBook Pro is macOS Catalina 10.15.7. (See: Identify your MacBook Pro model - Apple Support )
To upgrade to Catalina, be sure to have a backup and see instructions in: How to download and install macOS - Apple Support
Be aware that if you upgrade to Catalina 10.15.7 you will also need to update any non-Apple 32-bit apps. See: https://www.stclairsoft.com/Go64/
or
https://www.macworld.com/article/232735/how-to-check-if-mac-software-is-32-or-64-bit.html